In Israel antibody levels are a way to get the "green passport". My parents get vaccinated in the US, and since israel doesn't recognize foreign vaccinations, when they visited Israel they had to get an antibody test to be let out quarantine early. As it should them having antibodies, they were let out. As Israel doesn't have data that says they were vaccinated, they were let out as "recovered" (even though as far as we know, neither ever caught covid, and my father was in in and of the hospital over the past year so was regularly tested).
As my mother is an Israeli citizen, she was given the "green passport", as my father was only in Israel on a "tourist visa", he was not. this is just an artifact of the current Israeli system where they aren't giving "green passports" to tourists, but demonstrating that one can give them to people that show sufficient antibodies.
The US seems to have a weird ideological opposition to the idea that recovered people have immunity from Covid, even though all the science indicates that they do. There's even weird articles in the press from time to time boggling at the fact that people don't care about getting vaccinated despite having caught Covid before, as though that somehow gave them more reason to think they needed a vaccine rather than less.
Maybe we just like controlling each other's behavior? Maybe we can't handle more than one input dimension at a time, and even then that dimension needs to be binary?
As my mother is an Israeli citizen, she was given the "green passport", as my father was only in Israel on a "tourist visa", he was not. this is just an artifact of the current Israeli system where they aren't giving "green passports" to tourists, but demonstrating that one can give them to people that show sufficient antibodies.